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Southwest Highlands

Confidence

High becoming low on Monday due to uncertainties regarding how far north and how quickly a frontal system bringing rain, snow and milder air pushes northwestwards across Scotland.

  • This evening
  • Saturday
  • Sunday
  • Further outlook

Friday 17 November 2017

Sunrise: 08:01   Sunset: 16:06
Moon phase: Waning crescent

Rather cloudy with frequent heavy and blustery snow showers. Severe westerly gales.

Saturday 18 November 2017

Weather hazards

Gales High likelihood Hide detail

Progress will be impeded by very strong winds. Walking will be difficult and strenuous at times with a potential for one to be blown over in gusts. There can be a marked increase in winds through cols or on exposed ridges and summits. Distances often take longer to cover with compass bearings becoming more difficult to follow accurately.

Severe chill effect High likelihood Show detail

Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

Poor visibility High likelihood Show detail

Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.

Blizzards Low likelihood Show detail

Blizzards and whiteouts present challenging and serious conditions due to a combination of falling or blowing snow, strong winds and cold temperatures. They can be highly disorientating, often resulting in near-zero visibility with limited or no visual references and no distinction between ground and sky. Cliff edges and cornices may not be apparent, even close up. These conditions require very good navigational skills.

Heavy snow Low likelihood Show detail

Expect snow to rapidly accumulate with deep drifts also possible during windy conditions. Progress will be time consuming and physically strenuous, which will significantly affect the distance one is able to travel on foot. Paths will become hidden and difficult to follow, while very poor visibility during snowfall will make route-finding challenging. A heightened avalanche risk is likely and avalanche reports should be consulted where available.

Storm force winds Low likelihood Show detail

Walking will be very strenuous with any mobility virtually impossible over exposed ground. There is a high likelihood of being blown over or taken off one’s feet, while even standing up may be impossible at times. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.

Thunderstorms Low likelihood Show detail

Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.

Forecast

Blustery snow showers and very windy

Weather at 800m

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Heavy snow Heavy snow Light snow Cloudy Cloudy Cloudy Cloudy Cloudy
70% 70% 50% 30% 20% 20% 20% 20%
Chance of precipitation
800 500 500 400 400 500 400 500
Freezing level (m)
The level above which snow is expected to settle or the ground is expected to be frozen

Wind speed and direction (mph) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
1100m W 47 58 NW 44 53 NW 38 46 NW 35 43 NW 36 44 NW 32 40 NW 30 36 NW 27 33
900m W 35 45 NW 27 35 NW 25 32 NW 25 33 NW 24 32 NW 22 29 NW 20 27 NW 19 26
600m W 34 44 W 25 32 W 20 26 W 22 28 W 22 29 W 21 28 SW 19 24 SW 15 19
300m NW 22 35 W 12 19 W 11 15 NW 11 16 NW 10 17 NW 8 14 SW 7 11 W 6 10
Glen W 14 34 SW 6 18 SW 5 11 W 5 14 NW 7 20 NW 7 19 NW 5 14 W 5 13

Temperature (°C) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
1100m -3 -5 -5 -6 -6 -5 -5 -5
900m 0 -2 -3 -3 -2 -2 -2 -2
600m 2 1 0 0 1 1 1 1
300m 4 3 2 2 3 4 3 2
Glen 6 5 4 4 6 5 4 4

Feels like temperature (°C) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
1100m -13 -17 -16 -16 -16 -15 -15 -14
900m -9 -11 -11 -11 -10 -9 -9 -9
600m -6 -7 -6 -7 -6 -6 -6 -5
300m -2 -2 -2 -2 -1 0 0 -1
Glen 2 3 2 2 3 3 2 2
Sunrise: 08:03   Sunset: 16:05
Moon phase: New

Weather

Clear spells and heavy, blustery snow showers through the early hours with a risk of thunder, the showers combined with the winds giving temporary blizzard conditions. The showers largely die out soon after dawn, just a few continuing across Mull, western Argyll and Arran with some good spells of sunshine developing, but some poor walking conditions are still likely with lying snow blowing and drifting in the strong winds.

Chance of cloud-free mountain/hill tops at 800m

Around 40% at dawn with occasional cloud above 750m lowering to 450m at times in association with showers rising to about 80% soon after dawn with patches of cloud above 750m.

Visibility

Poor or very poor in snow showers and near zero in temporary blizzards and blowing or drifting snow, but becoming mainly very good or excellent with some good views of recently snow covered hills developing.

Met Office Aberdeen meteorologist's view

Gusts over ridges and summits close to 65mph at least through the early hours slowly easing, producing a severe chill effect.

Sunday 19 November 2017

Sunrise: 08:05   Sunset: 16:03
Moon phase: New

Weather

Mainly dry with some good spells of sunshine, however cloud increasing above the summits through the afternoon with outbreaks of snow spreading northeast through the evening.

Temperature

  • At 800m Around minus 3 Celsius
  • Glen Around minus 5 Celsius at dawn rising to plus 7 Celsius by day
  • Freezing level Around 600m

Visibility

Very good or excellent falling poor in snow showers and snow later and very poor in any drifting or blowing snow at first.

Chance of cloud-free mountain/hill tops at 800m

Around 80% with occasional cloud above 750m, falling during the evening as cloud bases lower.

Maximum wind speed expected

Northwesterly around 30mph, gusts over ridges and summits around 45mph, gradually backing southerly and decreasing 15mph or less.

Monday 20 November 2017

Sunrise: 08:07   Sunset: 16:02
Moon phase: New

Rather cloudy with outbreaks of snow, these turning increasingly to rain below about 900m but becoming drier through the afternoon. Strengthening easterly winds. Freezing level around 600m rising to 1000m for a time

Tuesday 21 November 2017

Sunrise: 08:09   Sunset: 16:00
Moon phase: New

Mostly cloudy with snow spreading northeast, the snow turning increasingly to rain at lower levels later. Occasionally strong easterly winds. Freezing level around 600m rising 1000m.

Wednesday 22 November 2017

Sunrise: 08:11   Sunset: 15:59
Moon phase: Waxing crescent

Heavy rain and summit snow expected to clear to sunshine and showers. Winds becoming strong to gale force westerly or southwesterly with freezing levels rising to 1200m.

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